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  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const r1 = 100 + "abc";
      console.log(r1); // String(100)+"abc"

      const r2 = true + "abc";
      console.log(r2); // String(true)+"abc"

      const r3 = null + "abc";
      console.log(r3); // String(null)+"abc"

      const r4 = undefined + "abc";
      console.log(r4); // String(undefined)+"abc"
    </script>
  </body>
</html>
